What type of study is this?

This is a Experimental Study study.

September 17, 2025

Assessing cerebral microvascular pulsatility using dynamic pseudo-continuous arterial spin labeling MRI

Puntos clave

The proposed method successfully measures the pulsatility index in cerebral microvessels, offering new insights into brain waste clearance.
Using dynamic pCASL MRI, we synchronized ASL signals with heartbeat, achieving reliable measurements of cerebral microvascular activity.
Numerical simulations identified factors affecting ASL signals, enhancing understanding of how to accurately measure pulsatility index.
This non-invasive MRI technique addresses a crucial gap in research, improving our understanding of glymphatic function related to brain health.

Resumen

Motivation: Directly imaging cerebral microvascular pulsation remains challenging, which, however, plays an important role in glymphatic function to facilitate waste clearance in perivascular space. Goal(s): To develop a dynamic pCASL method for measuring the cerebral microvascular pulsatility index (PI). Approach: Dynamic pCASL imaging is implemented to image blood flow in cerebral arterioles. Resulting ASL signals were retrospectively synchronized with heartbeat to resolve ASL signal pulsations across cardiac cycle. Numerical simulations were conducted to investigate the confounding effects on ASL signals including labeling efficiency and ATT due to heartbeat. Results: Our results demonstrated the feasibility and reliability of proposed approach in measuring the microvascular PI. Impact: We proposed a non-invasive MRI technique to reliably measure cerebral microvascular pulsatility, which fills a significant research gap in research related to brain waste clearance.

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